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Back projector display device

A display device, rear projection technology, applied in the direction of optical components, optics, instruments, etc.

Inactive Publication Date: 2007-03-21
CHUNGHWA PICTURE TUBES LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The light source emits a beam of light

Method used

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  • Back projector display device
  • Back projector display device
  • Back projector display device

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Embodiment Construction

[0056] FIG. 5 is a schematic structural view of a rear projection display device in a preferred embodiment of the present invention. Referring to FIG. 5 , the rear projection display device 200 includes an optical engine 210 , a projection lens 220 , a Fresnel mirror 230 and a screen 240 . Wherein, the optical engine 210 includes a light source 212 and a display element 214 . Light source 212 emits light beam 250 . The display element 214 is located on the transmission path of the light beam 250 , and the light beam 250 forms an image light beam 260 through the action of the display element 214 . The projection lens 220 is located on the delivery path of the image beam 260 behind the display element 214 . The Fresnel mirror 230 is located on the transmission path of the image beam 260 after the projection lens 220 , and the image beam 260 is parallelized by the reflection of the Fresnel mirror 230 . The screen 240 is located on the transmission path of the image beam 260 be...

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Abstract

A back projection display unit includes the optical engine, the projection lens, the Fresnel reflection lens and the screen. The optical engine includes the light source and the display unit. The light source emits the beam and the display unit is in the beam path which forms the image beam. The projection lens is in the path of the image beam after the display unit. The Fresnel reflection lens is in the path of the image beam after the projection lens and the image beam is parallel reflected by the Fresnel lens. The screen is in the path of the image path after the Fresnel reflection lens. So it can control the direction of the image beam through the reflected Fresnel reflection lens.

Description

technical field [0001] The present invention relates to a rear projection display device, and in particular to a rear projection display device using a reflective Fresnel mirror. Background technique [0002] Due to the rapid development of optical technology, many display devices have been developed and applied in daily life. Among them, the rear projection display device has the advantages of large-size display and high contrast, so it is regarded as an important development trend in the display. Generally speaking, in the rear projection display device, the viewer and the projector are located on two sides of the screen respectively, and the viewer views the image through the projection light transmitted from the screen by the projector. [0003] FIG. 1 is a schematic structural diagram of a known rear projection display device. Referring to FIG. 1 , a known rear projection display device 100 includes an optical engine 110 , a projection lens 120 , a mirror 130 and a sc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B27/18
Inventor 陈志隆张燃宏郑伊凯周明德
Owner CHUNGHWA PICTURE TUBES LTD